Dates sometime display in PST, sometimes in UTC

The majority of my events are being displayed in my local timezone (PST), but sometimes I see events in UTC. The data comes from Segment, which for example sent two events with the following timestamps:

Event 1:

"2019-02-14T17:47:12.901Z"

Event 2:

"2019-02-14T17:47:24.284Z"

When I view these events in a Mixpanel User Profile, they're displayed with the following times:

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